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Figure 2: (a) The energy windows used in triple-energy window method by the trapezoidal approximation for the first photopeak window (154–188 keV). (b) The estimation of scatter area of the first photopeak window by the trapezoidal approximation along with the spectrum of true scatter counts into this energy window

Figure 2: (a) The energy windows used in triple-energy window method by the trapezoidal approximation for the  first photopeak window (154–188 keV). (b) The estimation of scatter area of the  first photopeak window by the trapezoidal approximation along with the spectrum of true scatter counts into this energy window